Pagini recente » Cod sursa (job #1849095) | Cod sursa (job #162168) | Cod sursa (job #1878255) | Cod sursa (job #3253846) | Cod sursa (job #2034209)
#include <iostream>
#include <queue>
#include <vector>
#include <fstream>
#define lim 100002
using namespace std;
queue <int> Q;
vector <int> G[lim];
int n, m, S, D[lim];
ifstream f("bfs.in");
ofstream g("bfs.out");
void Read()
{
f >> n >> m >> S;
int x, y;
for(; m; --m)
{
f >> x >> y;
G[x].push_back(y);
}
}
void Read_Out()
{
for(int i = 1; i <= n; ++i)
g << D[i] << " ";
}
void BFS()
{
while(!Q.empty())
{
int F = Q.front();
for(vector <int> :: iterator it = G[F].begin(); it != G[F].end(); ++it)
{
if(D[*it] == -1)
{
D[*it] = D[F] + 1;
Q.push(*it);
}
}
Q.pop();
}
}
int main()
{
freopen("bfs.in" , "r", stdin);
freopen("bfs.out", "w", stdout);
Read();
for(int i = 1; i <= n; ++i)
D[i] = -1;
D[S] = 0;
Q.push(S);
BFS();
Read_Out();
}